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Related Experiment Video

Updated: May 3, 2026

Mitochondrial Ca2+ Retention Capacity Assay and Ca2+-triggered Mitochondrial Swelling Assay
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Mitochondrial Ca2+ Retention Capacity Assay and Ca2+-triggered Mitochondrial Swelling Assay

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Mitochondrial Na+/Ca2+ exchange assays.

Raz Palty1, Varda Shoshan-Barmatz

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, California 94720;

Cold Spring Harbor Protocols
|February 5, 2014
PubMed
Summary
This summary is machine-generated.

We developed novel assays to measure mitochondrial sodium-calcium exchange activity in intact cells. These methods utilize fluorescent probes and avoid mitochondrial isolation, preserving cellular structure for accurate analysis.

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Area of Science:

  • Cell Biology
  • Mitochondrial Physiology
  • Ion Transport

Background:

  • Mitochondrial function is regulated by ion transport, including sodium-calcium exchange.
  • Accurate measurement of mitochondrial Na+/Ca2+ exchange is crucial for understanding cellular homeostasis.
  • Existing methods often require mitochondrial isolation, which can alter native function.

Purpose of the Study:

  • To develop and validate two novel, complementary assays for analyzing mitochondrial sodium-calcium exchange activity.
  • To enable the study of mitochondrial ion transport within the native cellular context.
  • To provide robust methods free from plasma membrane transporter interference.

Main Methods:

  • Assays utilize permeabilized cells loaded with mitochondria-selective fluorescent probes (CoroNa-Red for Na+, ratiometric-pericam for Ca2+).
  • Counter-ion transport across the inner mitochondrial membrane is directly measured.
  • Cytosol equilibration with the extracellular milieu allows precise control of the ionic environment.

Main Results:

  • Successful measurement of mitochondrial Na+/Ca2+ exchange activity in intact, permeabilized cells.
  • Demonstration that the assays maintain native mitochondrial architecture.
  • Validation of methods that eliminate interference from plasma membrane transporters.

Conclusions:

  • The described assays provide a robust and accessible approach to study mitochondrial Na+/Ca2+ exchange.
  • These methods preserve cellular integrity, offering more physiologically relevant data.
  • The assays facilitate research into mitochondrial ion dynamics and related pathologies.